Comet nucleus

Quick Facts: Who was Comet nucleus?

Subject:

Comet nucleus

Known for:

The solid, central body of a comet, composed of rock, dust, and frozen gases.

Verified Source:

2Day Chrono-Wiki & Primary Historical Archives

Origins & Early Life

The comet nucleus is the solid, central part of a comet. A cometary nucleus is composed of rock, dust, and frozen gases. When heated by the Sun, the gases sublime and produce an atmosphere surrounding the nucleus known as the coma.

Career & Major Achievements

The force exerted on the coma by the Sun's radiation pressure and solar wind cause an enormous tail to form, which points away from the Sun. A typical comet nucleus has an albedo of 0.04. This is blacker than coal, and may be caused by a covering of dust.

Enduring Legacy & Impact

Results from the Rosetta and Philae spacecraft show that the nucleus of 67P/Churyumov–Gerasimenko has no magnetic field, which suggests that magnetism may not have played a role in the early formation of planetesimals. Further, the ALICE spectrograph on Rosetta determined that electrons (within 1 km (0.62 mi) above the comet nucleus) produced from photoionization of water molecules by solar radiation, and not photons from the Sun as thought earlier, are responsible for the degradation of water and carbon dioxide molecules released from the comet nucleus into its coma. Comet nuclei, at ~1 km to at times tens of kilometers, could not be resolved by telescopes.

Historical Fact-Check Quiz: Comet nucleus

True or False: “The primary mechanism responsible for the degradation of water and carbon dioxide molecules from the comet nucleus into its coma is direct photoionization by solar photons.”

Answer (FALSE ❌): The degradation process is actually attributed to photoionization of water molecules by solar radiation, creating electrons that drive the chemical reactions, not direct photon impact.

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